Who killed Tanjiro's family?

In Demon Slayer: Kimetsu no Yaiba, Tanjiro's family was killed by Muzan Kibutsuji, the leader of the demons. Here's the detailed story behind their tragic deaths:

The Tragedy of Tanjiro's Family:

Tanjiro's family was living a peaceful and simple life in the mountains. His father had passed away years earlier, and his mother, along with his siblings, took care of their household.

One winter, Tanjiro went down to the village to sell charcoal, leaving his family behind. When he returned, he found his entire family slaughtered by demons. His mother and siblings were all brutally killed, with their bodies mutilated and left in a state of despair.

Muzan Kibutsuji’s Role:

It is Muzan Kibutsuji, the first demon, who is responsible for the massacre. Muzan had been searching for a cure to his demon condition, and he killed Tanjiro's family as part of his insatiable pursuit for power. Tanjiro’s family members were not turned into demons by Muzan, but instead were killed outright.

However, in the tragedy, Nezuko, Tanjiro's younger sister, was turned into a demon by Muzan. When Muzan attacked the Kamado family, Nezuko became the sole survivor, but she was transformed into a demon as a result of Muzan's actions.

Why Did Muzan Kill Tanjiro’s Family?

Muzan's primary goal was to create more demons and find a way to overcome the weaknesses of sunlight and demon slayers. In the case of Tanjiro's family, he killed them because they were in the wrong place at the wrong time — they happened to be near him when he attacked, and Tanjiro's mother was a potential threat to him as well.

Additionally, Muzan may have targeted the Kamado family because they were known to have a connection to the ancient Sun Breathing technique, which could be a possible threat to him in the future.

Tanjiro’s Motivation:

After witnessing the brutal murder of his family, Tanjiro vowed to become a Demon Slayer to avenge them and to find a way to turn Nezuko back into a human. His journey begins with this tragedy, seeking justice for his family and a way to stop the evil that is Muzan.

Conclusion:

Muzan Kibutsuji was responsible for killing Tanjiro’s family. His actions set Tanjiro on his path to becoming a Demon Slayer, seeking to end Muzan’s reign of terror and free his sister Nezuko from the curse of demonhood.